Gb/T 20257 2025. Gb / t 20257.1 ― 2017 《国家基本比例尺地图图式 第 1 部分： 1 ︰ 500 1 ︰ 1 000 1 ︰ 2 000 地形图图式》代替 gb / t 20257.1 ― 2007 《国家基本比例尺地图图式 第 1 部分： 1 ︰ 500 1 ︰. Gb/t 20257 的本部分规定了 1:500、1:1000 和 1:2000 地形图上表示的各种自然和人工地物、地貌要素的符号和注记的等级、规格和颜色标准，以及图幅整饰规格和使用这些符号的原则、要求.
1 000 、 1 : Generic guidelines for the application of gb/t 19001, gb/t 19002 and gb/t 19003;
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